Based on the side lengths given (a, b, and c), which triangles are right triangles?

Type the correct answer in each box. spell all the words correctly, and use numerals instead of words for numbers. if necessary, use / for the fraction bar(s).

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.

Order 1100000, 314000, 965000, 1890000, from least to greatest.